:root{--navy: #0b3a6e;--navy-2: #0e4d8c;--ink: #122033;--muted: #5b6b7c;--line: #d9e1ea;--bg: #eef3f8;--card: #ffffff;--amber: #e8a317;--amber-2: #fff4d6;--green: #1f9d6c;--red: #c0392b;--shadow: 0 10px 30px rgba(11, 58, 110, .08);--radius: 16px;font-family:Segoe UI,PT Sans,system-ui,sans-serif;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}button,input,select,textarea{font:inherit}a{color:inherit}.login-page{min-height:100vh;display:grid;grid-template-columns:1.1fr .9fr;background:radial-gradient(circle at 20% 20%,rgba(232,163,23,.18),transparent 28%),linear-gradient(160deg,#082445,#0b3a6e 55%,#1460a8);color:#fff}.login-brand{padding:56px;display:flex;flex-direction:column;justify-content:center}.login-brand h1{font-size:44px;margin:8px 0 12px;letter-spacing:-.03em}.login-brand p{max-width:480px;color:#ffffffd1;line-height:1.5}.badge{display:inline-flex;align-items:center;gap:8px;background:#ffffff1f;border:1px solid rgba(255,255,255,.2);padding:6px 12px;border-radius:999px;font-size:13px;width:fit-content}.login-panel{background:var(--card);color:var(--ink);margin:24px;border-radius:24px;padding:32px;display:flex;flex-direction:column;box-shadow:var(--shadow)}.login-panel h2{margin:0 0 8px}.demo-grid{display:grid;gap:10px;margin:18px 0 8px}.demo-btn{text-align:left;border:1px solid var(--line);background:#f8fbff;border-radius:12px;padding:12px 14px;cursor:pointer}.demo-btn:hover{border-color:var(--navy);background:#eef6ff}.demo-btn b{display:block}.demo-btn span{color:var(--muted);font-size:13px}.form{display:grid;gap:10px;margin-top:16px}.form input,.form select,.form textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;background:#fff}.btn{border:0;border-radius:10px;padding:10px 14px;cursor:pointer;background:var(--navy);color:#fff;font-weight:600}.btn.secondary{background:#e8eef5;color:var(--navy)}.btn.amber{background:var(--amber);color:#2b2108}.btn.danger{background:var(--red)}.btn.ghost{background:transparent;color:var(--navy)}.error{color:var(--red);font-size:14px}.app-shell{display:grid;grid-template-columns:260px 1fr;min-height:100vh}.sidebar{background:var(--navy);color:#fff;padding:22px 16px;display:flex;flex-direction:column;gap:18px}.brand{font-weight:800;font-size:20px;letter-spacing:-.03em}.brand small{display:block;font-weight:500;opacity:.7;font-size:12px}.nav{display:grid;gap:6px}.nav a{text-decoration:none;padding:10px 12px;border-radius:10px;color:#ffffffd1}.nav a.active,.nav a:hover{background:#ffffff1f;color:#fff}.user-chip{margin-top:auto;background:#ffffff1a;border-radius:12px;padding:12px}.user-chip b{display:block}.user-chip span{font-size:12px;opacity:.8}.main{padding:22px 26px 40px}.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}.topbar h1{margin:0;font-size:26px}.bell{position:relative}.bell button{background:#fff;color:var(--navy);border:1px solid var(--line)}.dot{position:absolute;top:-4px;right:-4px;background:var(--amber);color:#2b2108;border-radius:999px;font-size:11px;font-weight:700;min-width:18px;height:18px;display:grid;place-items:center;padding:0 4px}.grid-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.card{background:var(--card);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow);border:1px solid rgba(11,58,110,.04)}.stat b{display:block;font-size:28px}.stat span{color:var(--muted);font-size:13px}.stack{display:grid;gap:14px}.row{display:flex;gap:12px;flex-wrap:wrap;align-items:end}.split{display:grid;grid-template-columns:1.4fr .8fr;gap:14px}.calendar{overflow:auto}.cal-grid{display:grid;grid-template-columns:64px repeat(7,minmax(120px,1fr));min-width:920px;border:1px solid var(--line);border-radius:12px;overflow:hidden}.cal-cell{border-top:1px solid var(--line);border-left:1px solid var(--line);min-height:44px;padding:2px;position:relative}.cal-head,.cal-time{background:#f5f8fc;font-size:12px;padding:8px;font-weight:700}.lesson-chip{background:var(--navy);color:#fff;border-radius:8px;padding:6px 8px;font-size:11px;line-height:1.25;cursor:pointer}.lesson-chip.completed{background:var(--green)}.lesson-chip.cancelled{background:#8a97a6;text-decoration:line-through}.lesson-chip.mine{background:var(--amber);color:#2b2108}.table{width:100%;border-collapse:collapse}.table th,.table td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);font-size:14px}.pill{display:inline-block;padding:3px 8px;border-radius:999px;font-size:12px;background:#e8eef5}.pill.ok{background:#ddf6ea;color:#146c48}.pill.warn{background:var(--amber-2);color:#7a5a0a}.notice{padding:12px;border-radius:12px;background:#f6f9fc;border:1px solid var(--line)}.notice.unread{background:var(--amber-2);border-color:#f0d48a}.muted{color:var(--muted)}.mobile-toggle{display:none}@media (max-width: 980px){.login-page{grid-template-columns:1fr}.login-brand{padding:28px 24px 8px}.login-panel{margin:0 16px 16px}.app-shell{grid-template-columns:1fr}.sidebar{display:none}.sidebar.open{display:flex;position:sticky;top:0;z-index:5}.mobile-toggle{display:inline-flex}.grid-stats,.split{grid-template-columns:1fr}.main{padding:16px}}